<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<script>
        var obj1 = {a: 1};
		var obj2 = {b: 2};
		var arr1 = [obj1];
		var arr2 = [obj2];
		
		var v1 = arr1.concat(arr2);
		var v2 = arr1.concat(...arr2);
		
		var v3 = arr1.push(arr2);
		var v4 = arr1.push(...arr2);
		
</script>

</body>
</html>